diff --git a/src/test/java/com/thealgorithms/maths/KaratSubaMultiplicationTest.java b/src/test/java/com/thealgorithms/maths/KaratSubaMultiplicationTest.java
new file mode 100644
index 000000000000..fcf84181a9f8
--- /dev/null
+++ b/src/test/java/com/thealgorithms/maths/KaratSubaMultiplicationTest.java
@@ -0,0 +1,14 @@
+import java.math.BigInteger;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class KaratSubaMultiplicationTest {
+    @Test
+    public void testMultiple() {
+        BigInteger a = new BigInteger("123456789");
+        BigInteger b = new BigInteger("987654321");
+        BigInteger expected = a.multiply(b);
+        BigInteger actual = KaratSubaMultiplication.multiple(a, b);
+        assertEquals(expected, actual);
+    }
+}